Grate structure



Sept. l, l93l.- J. B. BLEwETT 1,820,932

GRATE STRUCTURE Filed May 7, 1927 2 Shoots-Shut 2 Fiyi.

34 34 By yw,m'MM

HIS A TTORNEYS.

" l Another ohjeet of in v invention is'to profk vide a sloping -grate that sha-ll, havethe 7 Patentedl Sept. 1, 1931 ppi-mation. ined May/i7; lea'zezifsermi .me 189mm;

4My f-invent'ifron relates to .gratel structure.

Ofnei object-ot 'my invention -ia fto provide-L l aV furnace f that Sha-1l, have ra fenced l d1=at-- atleast loelovvthe ygra-te."-

vide:` a l furnace thatfsliall have Y'a Yfo'reed; vdraft vision li' infade for varying'the i air flilast.'A

ily'remova-ble lfifoniaiire box.

Another object of my. invention" isutoprovide a multiseetio'n' grate; the 'diferen't eee-v tijo'ns ef z which 'may befquick'ly separated.:

v Ajfiirther object' of inv invention is to pro-l vide a multi-Section grate 4fora 'fire bx that shallfhave'thfe section' adj'o'entt tlie hottest# fire bed A'readily detachable from the main seetion oi 'the lgrate.

lower section readily detachable. andir'eplaceableg'* f5 Incertain typesoi'fiirnaeesfitii*desirable timmy' be famed ini@ the niet@ above and belowtheuelloedf Infsii'ch3 f'iirnaee's itisy preferable that thepressurebeloiv thefiel bed Shall h'niateri allyviniexe'epf th'at thaleia @dalla accordingly litis' desirable to/,provide v"means Vfor regiillat'i'ng suli blast,

@Specially Whn bah blasen@ attachee man Same souree'o'f 'Compressed Jair. ccordhgly,.1have provideda furnace, in which an air Q5 conduit'. is conne'etedtojthe fire bei( either 'eoldnffuel., Aecordinglyi I rhave provided Ta gratethatiisfin two"s:'eet'inns5fl the Vuppervor mejor Seetionbeing detaehablvseeured atits upper end vto 'the-nnnaee Walls and supported at'itsgloiverend byfanjofset portion having e? openings- -vtherein f for thepassage of lair, yand J Anotherobjeet ofniyfinventioliislto pro-f Another .'oloj eet "of .inventionv is f to pro'-l I 'videfgra'teor a. 'furnace'tli'at 'shalfl Vloe read--`v also having .provision for the fqniek atta'eh mentof another egratefsection'. Y I'nioperatin I i have found. lthat, "it -is rarelyli. necessary Ito A, replace the major portion of the t"frate, b'tf. that the lower 4)portions should be Vreplaced 55m from time .to .ti-ine, therebyyresultig, A'i1`1,a substantial. saving in., material.. Overv the4 In; the'V accompanying; drawing'siwhieh rep; we resent an illustrative Aeiriloodiinent ofv in'yginz. venti on, but'A are not adimitatfon thereof,

Figure -1 isaview, partiyallydinelevatidni and partially in section, of a kiln embodying?, myinvention.;l .j i 55"? Figure@ isan enlarged :viewiof a portinE of the invention, shoivnrin ,Fi'gzurewk Y Figure,3iiaabroken-planvieiv of th'ef'rnace` grate; i

Eigurefft is'anendview ythereof;A 70h;

n Fignreiis anend Seetionalviewxof hiper: i tionof thegrat'e; Y 'e Figure 6 isay sectional vie'vv of support? ing, plateffor ,the grate and:

n FigureT/is a` l)rokensidevie-Wv of VV{muni-i 75%' tan-'y 4grate strguetuite. .i

Rieferringto FigureA 1, illy,irifve'nl'.io'n` iiiy eoinpi'isea furnaeeifl, that Jnaygbeakilnorf connected to n.af boiler as desi'iedi. in, fivlieli is disposedga ife box Zand/agita@ 3for."siip; 8%.' portinga fuel bed, the dairies', frioiniiivhieli pass fupifvardly tliiough'a ehainbi .5 into. the kiln yor boiler eliainbr i6; 'and' f7 A`and f8, connected yto .the lire floog; respectively, above and below the grate .and 'siippli'e'd lwith cong 85k pressed air from a. snpplv line \9." .e Asl lpointed out hereinafter,v however. the fiiipei ,ay b omitted or clit. out of eviee@Y 4 v The ifurnaeenl millbe e'oiitlriitedy dtiffany; desired materil The fiie bx 2 ,j's ,providedl 90 withv anietallie ,door 11 .mounted fiithe fuir@ nace l :and a eupportingand .elosure ,plate :12 attached. to the ador 11 .aaa supported b5/a bearnrl?) ,andf-,airod.14, A Blqvv the lafte. 12 the Chamber 2 is' provided ivitli'thefiisilal. ashy 95 pit 15.,. 'i

i Herring paaiaiiaifiy minigufeaeitas, tliegrate 'iS' eonstitiited by; liinjf s'e'etii lethae Yte-p ivi iefi wana hfbk, 17 .at-1 itsgupper; end. fangaging-ia,ftd-:immune 1M 13. The outer ends of the offset portion 19 are cut away, as at 21, to provide openings for the passage of air yand ashes. A smaller grate section 22 is provided with lugs 23 for insertion into openings 24 in the offset portion 19 ofthe grate 16 in order that the grate portion 22may be quickly removed andV replaced when desired. The lower end face of the grate 22 is provided with longitudinally extending grooves 25 that provide a. passage` way for ashes and air when the grate is resting onthe plate 12 directly over the supporting rod 14.' Both grate sections 16 and 22 are provided with a plurality ofk upwardly converging openings 26 air. y Y

The grate 3 andthe supporting plate 12 togetherfconstitute a partially enclosed chamber that is yconnect-ed to the pipe 8 and for the passage of is' normally'under a greater pressure thanV 'is the remainder ofthe fire box. The Vplate 12fniay'be constituted by major and minor sections 27 and 28.k The section 28 may be secured to the section 27 by lugs similar to the'lugs 253y on the'grate sectionf22, if desii-ed.' v

The pipes 7 and 8 are provided'withV gates 29Nand'31, respectively, for controlling the pressure of the vair supplied therethrough.

' In the operation of 'the furnace embodying my invention, coal is fed downwardly ont-o the grate 16 in the usual manner and its temperature increases as itk moves downwardly until the areav of the greatest heat intensityv is found vabove gratesection 22. Air under pressure may be supplied through the pipes 7 and 8 from above Iand below the grate, al-

though it is preferable to have the air Ypressure confined below the Vvgrate considerably in excess of that above the grate, and if defired the connection 7 may be omitted entirelyfAs the body fuel 4 movesdownwardlyT some particles of` ashes. and fuel dust drop through the openings 26 vrand slide along the plate 12 through the openings 21 and grooves25 into the ashpit, although the bulk of thefashes are discharged directly from the grate V'section 22.

I have (found that after continued use, the grate. section 22 may be burned out while the grate section 16 is still in good condition. In su'clrcase, I am able to easily remove .the lugs 23 from the holes 24 and to bodily remove the grate. section 22 and replace it without having tomove the entire'grate 16. If necessary, the. plate section 28 may be removed 'at the same time.

`l-In the event the furnace is operated by supplying.' air entirely below the grate either by .eliminating the connection 7 entirely or by cutting off the How ofv air therethrough, the desired relative proportions of air above and below the grate are obtained by the eX- tent of the fuel bed. By concentrating the fuel bed on the extreme lower portion of the grate and leaving the upper portion substantially clean, considerable air passes above the grate, while by varying the distance the fuell bed is permitted to extend upthe grate, the amount available for air passage is correspondingly varied and the desired conditions thereby maintained. Y v

Referring to Figure?, I haveshowna'unitary grate both ends of which are provided with hooks 32, the extremities of which are provided withV grooves 84 corresponding to the grooves 25 in the grate section 22. This form of grate may be secured to the supporting rod 18 at either end since both ends are V provided with supporting hooks and grooves.

` Accordingly, I have providedaV irebox in which, air under pressure is supplied Vfrom above and vbelow the grate in predetermined proportions, and in which the fire moves downwardly across a perforate grate, the lower section of which isreadily detachable forrenewal when necessary without necessitating the handling of themajor section of the grate. fj l As the fuel moves downwardly over the sloping grate at a uniform rate in accordance with the character ofthe fuel, the depth of the fuel bed and the inclination of thegrate, and as the pressure of the air aboveand below the grate may be controlled at will, it is possible to maintain a controlled air supplvto the entire fuel hed during its movement along the grate. Y i' I While I have shown the fire box as incorporated'in a masonrv structure, it is to be understood `that the fire box may be used in connection with a kiln, boilers,..or any other apparatus requiring a fire box/ofmaterial slze. Y

in the size.shape, Vdisposition `and arrangement'of the component parts of invention may. bemadewithout departing from the scope of the appended claims.

I claim: Y Y

. 1; A grate unithaving lugs at one end for attachment to securing means, the other end. of the grate being'provided with va supporting portion having a bearing,v surface provided with grooves, whereby. when the grate unit is in engagement with a supporting member passageways are provided for the escape of matter from beneath the grate.

2. A grate structure comprising a base having a large portion and a'readily remov-` ablesmall end portion,'a`grate section overlying the large portion of the base and a small grate section removably attached to the large Ygrate section andfoverlying the small section of the base whereby the smaller sections of the baseand grate are removable It is to bev understood thatvarious changesv without disturbing the larger portion of the base and section of the grate.

3. A grate structure comprising a base having a large portion and a readily removable small end portion, a grate section teri minating in agrooved, 'offset portion resting Y upon said large base portion with the grooves opening thereto, said grate section havin@ a seat formed at least in part by said obset 1o portion, and an end grate section engaging said seat and having a grooved portion for engaging said end base portion, whereby solid matter moving along the base portions beneath the grate sections escape through said grooves. 1

4. A grate structure comprising a grate unit provided at one edge with a supporting portion having a grooved bearing surface and forming at least in part a seat, and a second grate unit cooperating Withsaid seat and having a grooved bearing surface at its opposite side, whereby the lower surface of saidgrate structure is provided with a series of grooves for permitting the escape of solid v matter from beneath the grate sections.

e 5. In a combustion device, a supporting plate therein, a grate sectionhaving supporting portions resting on said plate and openings between said portions` for discharging air and ashes from the rspace between said plate and the grate section.

6. A grate structure comprising a bottom plate, a major grate section having supporting :feet resting on said plate, and a minor grate section having one end resting on said A plate andthe other on said major section,

removably attached thereto.

In testimony whereof I have hereunto set n my hand.

4o v B. BLEWETT.

:soV 

